Weather2 on Twitter Weather2 on Facebook Weather2 on YouTube Weather2 blog

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Porchfield 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Porchfield

Hampshire, United Kingdom

Long range weather outlook for Porchfield includes 14 day forecast summary:

For Porchfield in the coming two weeks the average daytime maximum temperature will be around 10°C, with a high for the two weeks of 13°C expected on the afternoon of Friday 21st. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Wednesday 26th at 5°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. It looks like Tuesday 18th will have the most precipitation with an accumulation of around 15.0mm. On the whole winds are likely to be moderate. The strongest wind will be experienced on the evening of Tuesday 18th, coming from a southerly direction, and reaching around 31mph. However, the maximum wind gusts are expected on Monday morning.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 16
Dec
21:00

W
W

20 / 32 mph 49 / 42°F 79% 1006 mb
Low level cloud: 24%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: low
33%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
Mon 17
Dec
00:00

WNW
WNW

19 / 32 mph 48 / 41°F 76% 1010 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

17 / 29 mph 48 / 41°F 76% 1013 mb
Low level cloud: 14%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

14 / 24 mph 48 / 42°F 77% 1016 mb
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 17%
Most Significant Cloud Type: low
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

13 / 24 mph 48 / 42°F 75% 1019 mb
Low level cloud: 8%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: low
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

SW
SW

13 / 28 mph 48 / 42°F 71% 1020 mb
Low level cloud: 12%
Mid level cloud: 6%
High level cloud: 14%
Most Significant Cloud Type: low
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SW
SW

17 / 36 mph 48 / 41°F 77% 1020 mb
Low level cloud: 34%
Mid level cloud: 15%
High level cloud: 96%
Most Significant Cloud Type: low
51%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SSW
SSW

19 / 40 mph 48 / 41°F 80% 1019 mb
Low level cloud: 50%
Mid level cloud: 85%
High level cloud: 84%
Most Significant Cloud Type: low
90%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

SSW
SSW

21 / 45 mph 48 / 40°F 84% 1019 mb
Low level cloud: 79%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: low
95%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Tue 18
Dec
00:00

SSW
SSW

24 / 50 mph 49 / 42°F 84% 1017 mb
Low level cloud: 83%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
98%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

S
S

26 / 53 mph 48 / 40°F 82% 1015 mb
Low level cloud: 90%
Mid level cloud: 6%
High level cloud: 75%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

S
S

26 / 51 mph 48 / 40°F 79% 1013 mb
Low level cloud: 56%
Mid level cloud: 7%
High level cloud: 82%
Most Significant Cloud Type: low
67%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

SSE
SSE

29 / 53 mph 49 / 41°F 71% 1010 mb
Low level cloud: 0%
Mid level cloud: 67%
High level cloud: 87%
Most Significant Cloud Type: medium
69%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

S
S

29 / 42 mph 50 / 42°F 71% 1007 mb
Low level cloud: 0%
Mid level cloud: 79%
High level cloud: 97%
Most Significant Cloud Type: medium
82%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
15:00

S
S

28 / 32 mph 51 / 43°F 79% 1003 mb
Low level cloud: 67%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.19 In of precipitation over the past 3 hours.
0.19 In
18:00

S
S

32 / 54 mph 50 / 42°F 86% 1002 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.28 In of precipitation over the past 3 hours.
0.28 In
21:00

W
W

16 / 21 mph 49 / 44°F 81% 1003 mb
Low level cloud: 49%
Mid level cloud: 93%
High level cloud: 8%
Most Significant Cloud Type: low
82%
Expect 0.08 In of precipitation over the past 3 hours.
0.08 In
Wed 19
Dec
00:00

SW
SW

16 / 32 mph 48 / 42°F 75% 1006 mb
Low level cloud: 22%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

SW
SW

17 / 33 mph 48 / 41°F 78% 1006 mb
Low level cloud: 42%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
77%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
06:00

WSW
WSW

15 / 28 mph 47 / 41°F 77% 1007 mb
Low level cloud: 1%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: medium
81%
Expect 0.09 In of precipitation over the past 3 hours.
0.09 In
09:00

WNW
WNW

9 / 13 mph 48 / 44°F 77% 1008 mb
Low level cloud: 0%
Mid level cloud: 75%
High level cloud: 100%
Most Significant Cloud Type: medium
78%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
12:00

WSW
WSW

11 / 16 mph 50 / 45°F 69% 1009 mb
Low level cloud: 14%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: low
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WSW
WSW

14 / 18 mph 50 / 45°F 73% 1009 mb
Low level cloud: 30%
Mid level cloud: 28%
High level cloud: 65%
Most Significant Cloud Type: low
47%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

WSW
WSW

15 / 21 mph 50 / 44°F 71% 1009 mb
Low level cloud: 16%
Mid level cloud: 44%
High level cloud: 71%
Most Significant Cloud Type: low
39%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SW
SW

19 / 30 mph 49 / 42°F 71% 1009 mb
Low level cloud: 0%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: medium
70%
Expect 0.07 In of precipitation over the past 3 hours.
0.07 In
Thu 20
Dec
00:00

WSW
WSW

19 / 33 mph 48 / 41°F 73% 1009 mb
Low level cloud: 12%
Mid level cloud: 75%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.11 In of precipitation over the past 3 hours.
0.11 In
03:00

WSW
WSW

18 / 29 mph 48 / 41°F 73% 1009 mb
Low level cloud: 13%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: medium
92%
Expect 0.06 In of precipitation over the past 3 hours.
0.06 In
06:00

WSW
WSW

17 / 28 mph 48 / 41°F 72% 1009 mb
Low level cloud: 10%
Mid level cloud: 62%
High level cloud: 97%
Most Significant Cloud Type: medium
93%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
09:00

WSW
WSW

21 / 37 mph 48 / 40°F 75% 1010 mb
Low level cloud: 25%
Mid level cloud: 38%
High level cloud: 9%
Most Significant Cloud Type: low
39%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
12:00

W
W

21 / 41 mph 48 / 40°F 72% 1011 mb
Low level cloud: 14%
Mid level cloud: 16%
High level cloud: 8%
Most Significant Cloud Type: low
20%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
15:00

W
W

18 / 36 mph 48 / 41°F 72% 1011 mb
Low level cloud: 9%
Mid level cloud: 44%
High level cloud: 10%
Most Significant Cloud Type: medium
68%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

W
W

17 / 33 mph 48 / 41°F 74% 1012 mb
Low level cloud: 10%
Mid level cloud: 37%
High level cloud: 33%
Most Significant Cloud Type: medium
65%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
21:00

WSW
WSW

14 / 27 mph 48 / 42°F 73% 1013 mb
Low level cloud: 7%
Mid level cloud: 24%
High level cloud: 85%
Most Significant Cloud Type: medium
46%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Fri 21
Dec
00:00

WSW
WSW

10 / 14 mph 51 / 47°F 73% 1011 mb
Low level cloud: 14%
Mid level cloud: 24%
High level cloud: 77%
Most Significant Cloud Type: low
32%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

S
S

8 / 12 mph 50 / 46°F 79% 1009 mb
Low level cloud: 70%
Mid level cloud: 39%
High level cloud: 79%
Most Significant Cloud Type: low
93%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

SSE
SSE

15 / 25 mph 49 / 43°F 89% 1006 mb
Low level cloud: 96%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.06 In of precipitation over the past 3 hours.
0.06 In
09:00

SSW
SSW

19 / 36 mph 51 / 45°F 93% 1003 mb
Low level cloud: 93%
Mid level cloud: 69%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.10 In of precipitation over the past 3 hours.
0.10 In
12:00

W
W

24 / 38 mph 54 / 47°F 82% 1004 mb
Low level cloud: 42%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: low
45%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
15:00

WNW
WNW

21 / 24 mph 55 / 49°F 75% 1008 mb
Low level cloud: 1%
Mid level cloud: 1%
High level cloud: 74%
Most Significant Cloud Type: high
73%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WSW
WSW

17 / 20 mph 53 / 49°F 81% 1010 mb
Low level cloud: 10%
Mid level cloud: 8%
High level cloud: 76%
Most Significant Cloud Type: low
22%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SW
SW

22 / 36 mph 52 / 45°F 85% 1010 mb
Low level cloud: 39%
Mid level cloud: 22%
High level cloud: 84%
Most Significant Cloud Type: low
57%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 22
Dec
00:00

WSW
WSW

26 / 53 mph 51 / 44°F 84% 1010 mb
Low level cloud: 39%
Mid level cloud: 4%
High level cloud: 63%
Most Significant Cloud Type: low
47%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
03:00

W
W

25 / 42 mph 50 / 43°F 78% 1011 mb
Low level cloud: 27%
Mid level cloud: 3%
High level cloud: 78%
Most Significant Cloud Type: low
37%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

21 / 34 mph 50 / 44°F 79% 1013 mb
Low level cloud: 31%
Mid level cloud: 8%
High level cloud: 53%
Most Significant Cloud Type: low
40%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

18 / 28 mph 51 / 45°F 79% 1016 mb
Low level cloud: 17%
Mid level cloud: 17%
High level cloud: 86%
Most Significant Cloud Type: low
33%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

W
W

17 / 28 mph 51 / 46°F 78% 1017 mb
Low level cloud: 30%
Mid level cloud: 15%
High level cloud: 89%
Most Significant Cloud Type: low
45%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

W
W

14 / 22 mph 52 / 47°F 80% 1018 mb
Low level cloud: 23%
Mid level cloud: 28%
High level cloud: 92%
Most Significant Cloud Type: low
43%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WSW
WSW

13 / 21 mph 52 / 47°F 84% 1020 mb
Low level cloud: 23%
Mid level cloud: 12%
High level cloud: 54%
Most Significant Cloud Type: low
33%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WSW
WSW

11 / 18 mph 51 / 47°F 87% 1022 mb
Low level cloud: 5%
Mid level cloud: 46%
High level cloud: 34%
Most Significant Cloud Type: medium
62%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 23
Dec
00:00

W
W

22 / 39 mph 45 / 37°F 72% 1005 mb
Low level cloud: 14%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.00 In
06:00

SSE
SSE

15 / 25 mph 48 / 42°F 87% 1017 mb
Low level cloud: 90%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.07 In
12:00

SW
SW

25 / 29 mph 57 / 52°F 89% 1018 mb
Low level cloud: 91%
Mid level cloud: 29%
High level cloud: 61%
Most Significant Cloud Type: low
100%
0.03 In
18:00

SE
SE

11 / 16 mph 50 / 46°F 88% 998 mb
Low level cloud: 89%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.09 In
Mon 24
Dec
00:00

W
W

22 / 47 mph 44 / 36°F 68% 1009 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.00 In
06:00

W
W

19 / 30 mph 46 / 38°F 79% 1007 mb
Low level cloud: 33%
Mid level cloud: 19%
High level cloud: 7%
Most Significant Cloud Type: low
40%
0.00 In
12:00

W
W

16 / 24 mph 47 / 41°F 69% 1010 mb
Low level cloud: 6%
Mid level cloud: 28%
High level cloud: 10%
Most Significant Cloud Type: medium
44%
0.00 In
18:00

ENE
ENE

6 / 7 mph 51 / 49°F 80% 1011 mb
Low level cloud: 31%
Mid level cloud: 86%
High level cloud: 94%
Most Significant Cloud Type: low
72%
0.06 In
Tue 25
Dec
00:00

WNW
WNW

17 / 34 mph 43 / 35°F 81% 1014 mb
Low level cloud: 22%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
37%
0.00 In
06:00

NNE
NNE

12 / 18 mph 42 / 36°F 84% 1016 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 16%
Most Significant Cloud Type: medium
6%
0.00 In
12:00

NW
NW

10 / 20 mph 43 / 37°F 81% 1022 mb
Low level cloud: 6%
Mid level cloud: 11%
High level cloud: 84%
Most Significant Cloud Type: medium
29%
0.00 In
18:00

NNE
NNE

17 / 19 mph 45 / 37°F 87% 1020 mb
Low level cloud: 58%
Mid level cloud: 2%
High level cloud: 33%
Most Significant Cloud Type: low
62%
0.00 In
Wed 26
Dec
00:00

W
W

11 / 18 mph 47 / 42°F 88% 1026 mb
Low level cloud: 84%
Mid level cloud: 64%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.00 In
06:00

NNE
NNE

21 / 40 mph 39 / 29°F 80% 1023 mb
Low level cloud: 29%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
29%
0.00 In
12:00

W
W

9 / 16 mph 49 / 45°F 86% 1029 mb
Low level cloud: 61%
Mid level cloud: 13%
High level cloud: 19%
Most Significant Cloud Type: low
68%
0.00 In
18:00

NNE
NNE

17 / 19 mph 43 / 35°F 78% 1029 mb
Low level cloud: 11%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.00 In
Thu 27
Dec
00:00

W
W

6 / 7 mph 53 / 51°F 86% 1033 mb
Low level cloud: 7%
Mid level cloud: 3%
High level cloud: 60%
Most Significant Cloud Type: medium
23%
0.00 In
06:00

N
N

12 / 21 mph 37 / 29°F 89% 1032 mb
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.00 In
12:00

SSW
SSW

9 / 13 mph 53 / 50°F 78% 1033 mb
Low level cloud: 56%
Mid level cloud: 38%
High level cloud: 33%
Most Significant Cloud Type: low
72%
0.00 In
18:00

N
N

8 / 9 mph 46 / 42°F 83% 1035 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 37%
Most Significant Cloud Type: medium
8%
0.00 In
Fri 28
Dec
00:00

SSW
SSW

10 / 14 mph 50 / 46°F 87% 1031 mb
Low level cloud: 1%
Mid level cloud: 12%
High level cloud: 66%
Most Significant Cloud Type: medium
16%
0.01 In
06:00

NNW
NNW

6 / 9 mph 39 / 34°F 90% 1035 mb
Low level cloud: 10%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
60%
0.00 In
12:00

SSW
SSW

16 / 22 mph 50 / 44°F 84% 1027 mb
Low level cloud: 57%
Mid level cloud: 59%
High level cloud: 65%
Most Significant Cloud Type: low
85%
0.00 In
18:00

WNW
WNW

5 / 6 mph 49 / 48°F 86% 1035 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.00 In
Sat 29
Dec
00:00

SW
SW

20 / 30 mph 52 / 46°F 88% 1024 mb
Low level cloud: 84%
Mid level cloud: 44%
High level cloud: 64%
Most Significant Cloud Type: low
100%
0.01 In
06:00

WSW
WSW

4 / 6 mph 44 / 42°F 84% 1033 mb
Low level cloud: 37%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: low
37%
0.00 In
12:00

WNW
WNW

12 / 18 mph 44 / 38°F 63% 1033 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 43%
Most Significant Cloud Type: medium
11%
0.01 In
18:00

SW
SW

9 / 13 mph 47 / 42°F 76% 1031 mb
Low level cloud: 74%
Mid level cloud: 3%
High level cloud: 21%
Most Significant Cloud Type: low
77%
0.00 In
Sun 30
Dec
00:00

WNW
WNW

16 / 25 mph 43 / 36°F 75% 1035 mb
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 13%
Most Significant Cloud Type: medium
24%
0.00 In
06:00

SW
SW

13 / 23 mph 45 / 38°F 85% 1028 mb
Low level cloud: 46%
Mid level cloud: 44%
High level cloud: 67%
Most Significant Cloud Type: low
69%
0.00 In
12:00

WNW
WNW

10 / 12 mph 47 / 43°F 69% 1040 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 14%
Most Significant Cloud Type: medium
9%
0.00 In
18:00

N
N

17 / 26 mph 44 / 36°F 80% 1028 mb
Low level cloud: 33%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.10 In
Mon 31
Dec
00:00

WSW
WSW

6 / 7 mph 51 / 48°F 84% 1041 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 7%
Most Significant Cloud Type: low
7%
0.00 In
06:00

NNE
NNE

11 / 20 mph 37 / 29°F 80% 1035 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
0.00 In
12:00

SSW
SSW

17 / 22 mph 48 / 42°F 77% 1038 mb
Low level cloud: 46%
Mid level cloud: 16%
High level cloud: 9%
Most Significant Cloud Type: low
52%
0.00 In
18:00

NE
NE

12 / 14 mph 44 / 37°F 74% 1038 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 17%
Most Significant Cloud Type: medium
9%
0.00 In

The day label given represents the local day relative to the local time for the location you are looking at.
(More Info)

Day

This time is corrected for local time zones and where possible for daylight saving times.
(More Info)

Local Time

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
(More Info)

Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
(More Info)

Speed/
Gust

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
(More Info)

Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
(More Info)

Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
(More Info)

Precip Amount

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
(More Info)

Cloud Amount

Here we try to capture the feel of the weather as an image – it will never be perfect but is useful for a quick overview.
(More Info)

Weather

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
(More Info)

Pressure